CN113436801A

CN113436801A - Soft non-combustible cable

Info

Publication number: CN113436801A
Application number: CN202110669185.5A
Authority: CN
Inventors: 唐波; 程洪建; 余晓富; 杨子仪; 曹永富; 曹昕; 刘少新; 王宇鹏
Original assignee: Guangdong Zhongbao Cable Co ltd
Current assignee: Guangdong Zhongbao Cable Co ltd
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2021-09-24

Abstract

The invention relates to the technical field of cables, and discloses a soft non-combustible cable which comprises at least one round conductor wrapped with an insulating layer, wherein an inner cushion layer and a fireproof layer are sequentially wrapped outside the insulating layer, an outer protective layer and a coating layer are sequentially arranged outside the fireproof layer, and the conductor is formed by stranding a plurality of annealed copper wires or formed by twisting a plurality of annealed copper wires. The flexible non-combustible cable has good bending property and low manufacturing cost.

Description

Soft non-combustible cable

Technical Field

The invention relates to the technical field of cables, in particular to a flexible and non-combustible cable.

Background

With the high development of economy and personal rights in China, fire safety is more and more emphasized by all social levels, and fire cables gradually become an important development direction of the safe electric energy transmission technology in China, and are counted according to data: in recent years, more than 60% of fires caused by various types of electricity in China are caused by electric lines (wires and cables), and bring immeasurable loss to life safety and property, so that the safety fire-fighting cable becomes a great importance in safety fire-fighting work.

With the issuance and implementation of the civil building electrical design standard GB 51348-, is not beneficial to laying and the like.

Disclosure of Invention

The purpose of the invention is: the defects of the prior art are overcome, and the non-combustible cable is designed, meets the standard requirements and has better bending performance.

In order to achieve the purpose, the invention provides a flexible and non-combustible cable which comprises at least one cylindrical conductor wrapped with an insulating layer, wherein an inner cushion layer and a fireproof layer are sequentially wrapped outside the insulating layer, an outer protective layer and a coating layer are sequentially arranged outside the fireproof layer, and the conductor is formed by stranding a plurality of strands of annealed copper wires or formed by twisting a plurality of strands of annealed copper wires.

Preferably, the number of the conductors is at least 2, a filling layer is arranged between the insulating layer and the inner cushion layer, and the filling layer is an inorganic mineral glass fiber rope.

Preferably, the insulating layer is wrapped around the conductor by 4-6 layers of first inorganic mineral insulating ceramic mica tapes in an overlapping mode.

Preferably, the lapping rate of the first inorganic mineral insulating ceramic mica tape lapping is 45% -50%.

Preferably, the inner cushion layer is wrapped by 4-5 second inorganic mineral insulating ceramic mica tapes in an overlapping mode on the insulating layer or the filling layer.

Preferably, the lapping rate of the second inorganic mineral insulating ceramic mica tape lapping is 20% -30%.

Preferably, the fireproof layer is wrapped on the inner cushion layer in an overlapping mode through a copper strip with the thickness of 0.1 mm-0.3 mm.

As a preferred scheme, the covering rate of the copper strip overlapping wrapping is 15% -20%.

Preferably, the outer protective layer is woven by inorganic glass fiber, and the weaving density of the outer protective layer is more than or equal to 95%.

Preferably, the coating layer is a high-temperature-resistant ceramic inorganic layer.

Compared with the prior art, the embodiment of the invention has the beneficial effects that:

according to the flexible non-combustible cable provided by the embodiment of the invention, the conductor is formed by stranding a plurality of strands of annealed copper wires or stranding a plurality of strands of annealed copper wires, so that the flexibility of the cable can be increased, the melting point of copper can reach 1083 ℃, and the gross heat value PCS is less than or equal to 0.01MJ/kg, so that the requirements of relevant standards are met; insulating layer, inner cushion layer and the flame retardant coating outside the conductor wrap up outside the conductor in proper order through the form around the package to be equipped with outer jacket and the two-layer protective layer of coating, can produce through general equipment and make, make length unrestricted, the cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a single conductor according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a plurality of conductors according to an embodiment of the present invention.

In the figure:

1. a conductor; 2. an insulating layer; 3. an inner cushion layer; 4. a fire barrier layer; 5. an outer jacket; 6. a coating layer; 7. and (5) filling the layer.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "inside", "outside", and the like, which are used in the present invention, are used for indicating the orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The terms "first" and "second" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 2, a flexible and non-combustible cable according to a preferred embodiment of the present invention includes at least one cylindrical conductor 1 wrapped with an insulating layer 2, an inner cushion layer 3 and a fire-proof layer 4 are sequentially wrapped outside the insulating layer 2, an outer protective layer 5 and a coating layer 6 are sequentially disposed outside the fire-proof layer 4, and the conductor 1 is formed by twisting a plurality of annealed copper wires or a plurality of soft copper wires.

In the flexible non-combustible cable, the conductor 1 is formed by stranding a plurality of strands of annealed copper wires or stranding a plurality of strands of annealed copper wires, so that the flexibility of the cable can be improved, the melting point of copper can reach 1083 ℃, and the gross calorific value PCS is less than or equal to 0.01MJ/kg, thereby meeting the requirements of relevant standards; insulating layer 2, inner cushion layer 3 and flame retardant coating 4 outside conductor 1 wrap up outside conductor 1 in proper order through the form around the package to be equipped with

outer jacket

5 and 6 two-layer protective layers of coating, can produce through general equipment and make, make length unrestricted, the cost is reduced.

Further, as shown in fig. 2, the number of the conductors 1 is at least 2, a filling layer 7 is arranged between the insulating layer 2 and the inner cushion layer 3, and the filling layer 7 is an inorganic mineral glass fiber rope. When the number of the conductors 1 is 2 or more, a filling layer 7 is required to be arranged between the insulating layer 2 and the inner cushion layer 3, the filling layer 7 adopts inorganic mineral glass fiber ropes, the physical and chemical properties of the inorganic mineral glass fiber ropes are still kept at the high temperature of 1000 ℃, the total heat value PCS of the inorganic mineral glass fiber ropes is less than or equal to 0.9MJ/kg, and the requirements of relevant standards are met. The filling layer 7 should select a proper specification according to the nominal sections of different cables to ensure compact filling.

Further, the insulating layer 2 is wrapped around the conductor 1 by 4-6 layers of first inorganic mineral insulating ceramic mica tapes. The thickness of the insulating layer 2 is related to different nominal sections of the cable, the volume resistivity of the first inorganic mineral insulating ceramic mica tape is more than or equal to 5 multiplied by 1013 omega.m, the dielectric strength is more than or equal to 20MV/m, and the cable can not be broken down at the high temperature of 1000 ℃ and 180min, so the cable can meet the electrical performance of 0.6-1 kV power cables, the total heat value PCS of the cable is less than or equal to 1.2MJ/kg, and the related standard requirements are met, and the first inorganic mineral insulating ceramic mica tape has the excellent performance of being not easy to absorb moisture, so that the cable has the characteristics of good insulating performance, better flexibility, convenience in bending, high temperature resistance level, low total heat value and the like. Preferably, the number of the first inorganic mineral insulating ceramic mica tape layers is preferably 4, 5 or 6, and the effect is better.

Further, the covering rate of the first inorganic mineral insulating ceramic mica tape overlapped and wrapped is 45% -50%. If the larger the nominal cross section of the cable is, the thicker the required thickness of the insulating layer 2 is, the different the number of layers of the first inorganic mineral insulating ceramic mica tape is, the cover overlapping rate is 45% -50%, and the number of layers of the first inorganic mineral insulating ceramic mica tape can be reduced under the condition of meeting the electrical performance. Preferably, the capping rate is preferably 46%, 47%, 48% or 49%, and the effect is more excellent.

Further, the inner cushion layer 3 is formed by wrapping 4-5 layers of second inorganic mineral insulating ceramic mica tapes on the insulating layer 2 or the filling layer 7 in an overlapping mode. If the number of the conductors 1 is 1, the inner cushion layer 3 wraps the insulating layer 2, and if the number of the conductors 1 is 2 or more, the inner cushion layer 3 wraps the filling layer 7. The thickness of the inner cushion layer 3 is related to the nominal section of the cable, the volume resistivity of the second inorganic mineral insulating ceramic mica tape is more than or equal to 5 multiplied by 1013 omega.m, the dielectric strength is more than or equal to 20MV/m, and the requirement of no breakdown at the high temperature of 1000 ℃ and 180min is met, so the electric performance of the 0.6-1 kV power cable can be met, the total heat value PCS of the cable is less than or equal to 1.2MJ/kg, and the related standard requirements are met.

Further, the covering rate of the second inorganic mineral insulating ceramic mica tape overlapping wrapping is 20% -30%. The inner cushion layer 3 does not play an insulating role, so the cover overlapping rate does not need to be high, and the cost can be reduced. Preferably, the capping rate is preferably 22%, 24%, 26% or 28%, and the effect is more excellent.

Furthermore, the fireproof layer 4 is wrapped on the inner cushion layer 3 by copper strips with the thickness of 0.1 mm-0.3 mm in an overlapping and winding mode. The melting point of copper can reach 1083 ℃, the gross calorific value PCS is less than or equal to 0.01MJ/kg, the fireproof layer 4 of the copper strip can block flame and heat from being transmitted to the insulating layer, and the copper strip is selected to be relative to the copper sheath of the BTTZ cable, so that the bending performance of the cable is excellent, and the cable is softer. Preferably, the thickness is preferably 0.15mm, 0.2mm, 0.25mm, and the effect is better.

Furthermore, the lapping rate of the copper strip lapping is 15% -20%. The fireproof layer 4 does not play an insulating role, and the fireproof performance is met, so that the cover overlapping rate is not required to be high, and the cost can be reduced. Preferably, the capping ratio is 16%, 17%, 18%, 19%, and the effect is more excellent.

Further, the outer protective layer 5 is woven by inorganic glass fiber, and the weaving density of the outer protective layer 5 is more than or equal to 95%. The inorganic glass fiber is woven into a net shape, the weaving density is more than or equal to 95 percent, a compact and solid outer protective layer 5 is formed, the physical and chemical properties of the inorganic glass fiber can be still kept at the high temperature of 1000 ℃, and the total heat value PCS is less than or equal to 0.9 MJ/kg.

Furthermore, the coating layer 6 is a high-temperature-resistant ceramic inorganic layer, is coated on the surface of the inorganic glass fiber outer protective layer 5 to form a closed damp-proof barrier layer, can enable the cable to play a role in water prevention and damp prevention, and can meet the requirement of keeping the physicochemical property of the cable at a high temperature of 1200 ℃, and the gross heat value PCS is less than or equal to 1.5 MJ/kg.

To sum up, the embodiment of the invention provides a soft non-combustible cable, which comprises a conductor, an insulating layer, a filling layer, an inner cushion layer, a fireproof layer, an outer protective layer and a coating layer, wherein the insulating layer is wound on the conductor in an overlapping mode, the filling layer is arranged between the insulating layer and the inner cushion layer, the inner cushion layer is wound on the filling layer in an overlapping mode, the fireproof layer is wound on the inner cushion layer in an overlapping mode, the outer protective layer is arranged outside the fireproof layer, and the coating layer is coated on the outer surface of the outer protective layer. The conductor is twisted through stranded annealing copper line or stranded annealed copper line is twisted again and is made, can increase the compliance of cable, and insulating layer and inner cushion layer are inorganic mineral insulating ceramic mica tape, and the filling layer is inorganic mineral glass silk fiber rope, and the outer jacket is woven by inorganic glass silk fiber and is formed, and the coating is high temperature resistant ceramic inorganic layer, and the material parameter of each layer is shown as the following table:

the temperature resistance grade of the material adopted by each layer of the soft non-combustible cable can reach 1000 ℃, the total heat value is less than or equal to 2.0MJ/kg, the important performance indexes of the A-grade non-combustible cable of GB 31247-.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A soft non-combustible cable is characterized in that: including at least one cylindrical conductor that has the insulating layer around the package, the insulating layer has inner bed course and flame retardant coating around the package in proper order outward, be equipped with outer jacket and coating outward in proper order outside the flame retardant coating, the conductor is formed or is formed by the compound hank of stranded annealed copper line.

2. A low-voltage cable according to claim 1, characterized in that: the number of the conductors is at least 2, a filling layer is arranged between the insulating layer and the inner cushion layer, and the filling layer is an inorganic mineral glass fiber rope.

3. A soft non-combustible cable according to claim 1 or 2, characterized in that: the insulating layer is formed by wrapping 4-6 layers of first inorganic mineral insulating ceramic mica tapes on the conductor in an overlapping mode.

4. A soft non-combustible cable according to claim 3, characterized in that: the covering rate of the first inorganic mineral insulating ceramic mica tape overlapped and wrapped is 45% -50%.

5. A soft non-combustible cable according to claim 2, characterized in that: the inner cushion layer is wrapped on the insulating layer or the filling layer in an overlapping mode through 4-5 layers of second inorganic mineral insulating ceramic mica tapes.

6. The flexible noncombustible cable according to claim 5, characterized in that: the cover lapping rate of the second inorganic mineral insulating ceramic mica tape lapping is 20% -30%.

7. A soft non-combustible cable according to claim 1 or 2, characterized in that: the fireproof layer is wrapped on the inner cushion layer in an overlapping mode through a copper strip with the thickness of 0.1 mm-0.3 mm.

8. The flexible noncombustible cable according to claim 7, characterized in that: the covering rate of the copper strip overlapping wrapping is 15% -20%.

9. A soft non-combustible cable according to claim 1 or 2, characterized in that: the outer protective layer is woven by inorganic glass fiber, and the weaving density of the outer protective layer is more than or equal to 95%.

10. A soft non-combustible cable according to claim 1 or 2, characterized in that: the coating layer is a high-temperature-resistant ceramic inorganic layer.